Question

13. A set of pulleys lifts an 800 N crate 4 meters in 7 seconds. What power was used?

Answer 1

457.14 Watt

Step-by-step explanation:

The information we have is:

Force:
`F=800N`

Distance:
`d=4m`

Time:
`t=7s`

the formula for the power is:

`P=(W)/(t)`

where
`W` is work, and
`t` si time.

Also, the formula for work is:

`W=F*d`

Where
`F` is the force, and
`d` is the distance.

Substituting the formula for work into the formula for power:

`W=(F*d)/(t)`

substituting all the values to find the power:

`P=((800N)(4m))/(7s)=(3200Nm)/(7s)\\ P=457.14W`

the power that was used is 457.14 Watt

Answer 2

Answer:power=457.1watts

Step-by-step explanation: